Results of statistical analyses of the comparison of phosphorous measurement laboratory methods

The study in the related article compares the phosphorus (P) analysis methods of ammonium lactate (AL), Mehlich 3 (M3); water extraction (P-WA(P)&P-WA(PO4)), cobalt hexamine (CoHex) and X-ray fluorescence (XRF, as an estimate of total soil P). The ratio of the P-content/XRF was calculated and compared with the whole dataset first. Based on the comparison of all the data there were significant differences between the results of P-WA(P) and P-WA(PO4) vs M3 and AL, CoHex vs M3 and CoHex vs AL methods (p<0.001). The influencing factors were also analysed for a more in-depth understanding of their role (CaCO3-content, pH, soil texture and clay content). The file contains the results of the statistical analyses.